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(C) Electron gain enthalpy is the energy released when an electron is added to a neutral gaseous atom. In the halogen group ($Group$ $17$), the expect

Vedclass · Accepted Answer

$Cl > F > Br > I$

Vedclass · Answer

(C) Electron gain enthalpy is the energy released when an electron is added to a neutral gaseous atom. In the halogen group ($Group$ $17$), the expected trend based on atomic size is $F > Cl > Br > I$ (where $F$ is the most negative). However, due to the very small size of the fluorine atom, the incoming electron experiences significant inter-electronic repulsion from the existing electrons in the $2p$ subshell. As a result, the electron gain enthalpy of chlorine $(Cl)$ is more negative than that of fluorine $(F)$. Therefore, the correct order of electron gain enthalpy (magnitude of energy released) is $Cl > F > Br > I$.

Among the following options, the correct trend in the electron gain enthalpy is

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